We have exhibited our devices on the prestigious MEDTEC UK exhibition in Birmingham

ONKOCET Ltd. has exhibited the devices from its portfolio on the MEDTEC UK exhibition in Birmingham, April 2011 through our partner Medical & Partners.

12.4.2011 12:27

Certification of SVIT infrared camera completed

The ONKOCET company has successfully reached the certification of yet another medical device, Infrared Camera SVIT. The Certificate can be found here. The videos from the device operation can be found here.

In October 2009 we have received CE certificate for another device from our portfolio, NO therapeutical device PLASON. You can find more information about this revolutionary device, used for healing of unhealing wounds, diabetic foot, or for cosmetical purposes, at our webpage, section "Medical devices" -> PLASON-NO Therapy.

Best regards

Team of ONKOCET Ltd. company

23.1.2009 15:30

Black body radiation

PRINCIPLE OF MICROWAVE METHOD OF CANCER DIAGNOSE

BLACK BODY RADIATION

Before we start to explain what is the main principle of microwave radiometry, we will discuss about the term "black body radiation". So, let's first explain what's a "black body". A "black body" is a theoretical perfect absorber (hypothetic body), which absolutely absorbs radiation of all wavelengths falling on its surface. It reflects no light at normal temperatures and thus appears black.

However, it is a theoretical model. Actual black bodies don't exist in nature - though its characteristics are approximated by a small hole in a box filled with highly absorptive material. The emission spectrum of such a black body was first fully described by Max Planck.

In 1900, Max Planck was working on the problem of how the radiation an object emits is related to its temperature.The intensities of the various wavelengths of radiation emitted by a black body depend only on its temperature.

Planck's law of black body radiation

In physics, Planck's law of black body radiation predicts the spectral intensity of electromagnetic radiation at all wavelengths from a black body at temperature T. Electromagnetic radiation can be imagined as a self-propagating transverse oscillating wave of electric and magnetic fields. ...As the temperature decreases, the peak of the black body radiation curve moves to lower intensities and longer wavelengths. ...

The wavelength is related to the frequency by Radiance and spectral radiance are radiometric measures that describe the amount of light that passes through or is emitted from a particular area.

Wavelengthis the distance between repeating units of a propagatingwaveof a given frequency. It is commonly designated by theGreekletterlambda(?). Examples of wave-like phenonomena arelight,water waves, andsound waves.

Wavelength?is inverse proportional with the frequency?(Greek "nu"), the number of wave periods per time unit passing a given point, as in

Frequency of waves

Frequency has an inverse relationship to the concept ofwavelength, simply, frequency is inversely proportional to wavelength?(lambda). The frequencyf is equal to thespeedvof thewave dividedby the wavelength?of the wave:

Whenwavesfrom amonochromaticsource travel from onemediumto another, their frequency remains exactly the same — only theirwavelengthandspeedchange.

Sinusoidal waves of various frequencies; the bottom waves have higher frequencies than those above. The horizontal axis represents time.

A black body is an ideal emitter which is capable of absorbing and emitting all frequencies of radiation uniformly. All black bodies heated to a given temperature emit thermal radiation. The radiation energy per unit time from a blackbody is proportional to the fourth power of the absolute temperature and can be expressed with Stefan-Boltzmann Law as:

For objects other than ideal blackbodies (the grey body concept) the Stefan-Boltzmann Law can be expressed as

For the gray body the incident radiation (also called irradiation) is partly reflected, absorbed or transmitted. The emissivity coefficient lies in the range 0 < ? < 1depending on the type of material (conductivity) and the temperature of the surface.

The Net Radiation Loss Rate

If an hot object is radiating energy to its cooler surroundings the net radiation heat loss rate can be expressed as: